The water around Taiwan’s Matsu Islands is currently glowing in a glorious shade of blue. Yes, that’s right–glowing. While the phenomenon may look like the result of some kind of radioactive material spilling into the ocean, the illumination is, in fact, caused by something much more harmless: algae known as noctiluca scintillans.

The glowing algae is actually known to be quite aggressive, as they eat other bacteria and plankton. But their presence is perfectly normal, and they pose no threat to the surrounding environment. The phenomenon is sometimes referred to as “Blue Tears.”

The good news is, you don’t necessarily have to go to Taiwan to see the glowing water. Noctiluca scintillans can be found in many countries that border an ocean, including China, Thailand, Vietnam, parts of the U.S., The Netherlands, Puerto Rico and more.